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0580/21 Oct/Nov 2025, Question 15: Standard Form

Cambridge IGCSE Mathematics 0580 · Paper 21 (Extended) · Non-calculator · 3 marks

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The question, in short

Convert 66 000 to standard form, then add 3.7 × 10⁸ and 3.7 × 10⁷, giving the result in standard form.

Summarised in our own words. Use the official paper for the exact wording and any diagrams.

Part (a) · 1 mark

Express 66 000 in standard form.

  1. 166 000 = 6.6 × 10 000
  2. 2= 6.6 × 10⁴

Answer6.6 × 10⁴

Part (b) · 2 marks

Calculate (3.7 × 10⁸) + (3.7 × 10⁷) and give the answer in standard form.

  1. 13.7 × 10⁷ = 0.37 × 10⁸
  2. 23.7 × 10⁸ + 0.37 × 10⁸ = 4.07 × 10⁸

Answer4.07 × 10⁸

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Also searched as: 0580/21/O/N/25 · 0580_w25_qp_21 · 0580 w25 21 · question 15.
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